FDTD法による誘導雷サージ解析

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  • FDTD Simulation of Lightning-induced Surges
  • FDTDホウ ニ ヨル ユウドウカミナリ サージ カイセキ

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<p>The finite-difference time-domain (FDTD) method has been frequently applied to simulations of lightning-induced surges in overhead power distribution and telecommunication conductors. The applications are classified into two types in terms of spatial dimension: 2D and 3D. About 30% of the simulations have employed the 2D FDTD method in the cylindrical coordinate system, which is computationally quite efficient compared to the 3D FDTD method. In the 2D simulations, the FDTD method is employed to express the distributed series voltage sources in terms of incident electric fields tangential to overhead conductors, to be incorporated in the equivalent distributed circuit of Agrawal et al. 's electromagnetic-field-to-conductor coupling model. There are two other representative coupling models that yield the same results as Agrawal et al. 's model does. One of the reasons for using the hybrid approach is that horizontal closely-spaced thin conductors can be represented easily by a distributed circuit. In many of the 3D FDTD simulations, the subgridding or nonuniform gridding technique has been used to represent horizontal closely-spaced thin conductors. About 70% of the FDTD simulations as of today have been concerned with induced surges associated with lightning strikes to flat ground, and about 30% with lightning strikes to the top of mountain, building, or tall object.</p>

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